SchobiHH said..Muppet said..Everything in life is a trade off. If you want to stay hooked in whilst off the plane and out of the straps, go long. If you want to generate more power into the board to get planing sooner, go short. In my experience, longer lines are also more likely to get snagged on your hook whilst maneuvering. I've been wave sailing since the 90s and I still use 20". Use whatever works for you. Don't follow trends, set them!

That is not a trend and will never be. Me sailing since the 70s can tell you one thing. If you don't change to longer lines you don't know what you miss. So much easier and relaxing windsurfing it is with them. The problem with many old guys is they don't understand that the sport progressed and they have to adjust to it. Life is always about learn something new and that is so much fun.. So wrt to lines. You have to adjust your harness technic. But it is not easy to get rid of old habits.
FYI I am only 42 and I am well aware of the sport's progression over the past 30 years.
I have tried longer lines and I prefer shorter, just as you prefer longer. The difference is, I do not believe I am right and you are wrong, because I believe there is no wrong answer. Both experienced amateurs and pro's use varying lengths because they have experimented with different lengths, so they use what suits them (as with every other single variable in windsurfing set up).
Also, you say that windsurfing is 'much easier and relaxing' with longer lines. That is exactly why I use shorter lines. We are not the same!
And i still believe long lines are trendy now just as short lines were trendy in the 90s (and they were pretty long in the 70s, so maybe it is you, who has not progressed?)